Heat pump system for vehicle

A heat pump system for a vehicle comprising:

• a cooling apparatus configured to include a radiator, a first water pump, a first valve, a second valve, and a reservoir tank which are connected through a coolant line, and to circulate a coolant in the coolant line to cool at least one electrical component provided in the coolant line;
• a battery cooling apparatus configured to include a battery coolant line connected to the coolant line through the first valve, and a second water pump and a battery module which are connected through the battery coolant line to circulate the coolant in the battery module;
• a chiller provided in the battery coolant line between the first valve and the battery module, through which a refrigerant passes, to adjust a temperature of the coolant by performing heat exchange between the coolant that is selectively introduced into the battery coolant line and a refrigerant;
• a heating apparatus including a heating line selectively connected to the coolant line through the second valve to heat a vehicle interior by using a coolant , and a third water pump and a heater provided on the heating line;
• an air conditioner including a cooling line selectively connected to the battery coolant line through a third valve to cool the interior of the vehicle by using a coolant, and a fourth water pump and a cooler provided in the cooling line;
• a centralized energy device connected to the heating and cooling lines in order to supply a coolant of a high temperature to the heating apparatus, and to supply a coolant of a low temperature to the an air conditioner, and selectively heat-exchanging heat energy generated upon condensing and evaporation of a refrigerant circulating an inside with each coolant supplied through the heating and cooling lines, and supplying a refrigerant to chiller;
• a branch line having a first end connected to the coolant line between the radiator and the second valve, and a second end connected to the first valve;
• and
• a chiller connection line connecting the chiller and the first valve separately from the battery coolant line.